Image compression encryption method and cloud auxiliary decryption method based on compressed sensing and optical transformation

• Main Authors: CHAI XIULI, LU YANG, GAN ZHIHUA, FU JIANGYU, TIAN YE, WANG YINJING
• Format: Patent
• Language: Chinese; English
• Published: 25.12.2020
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention provides an image compression encryption method and a cloud auxiliary decryption method based on compressed sensing and optical transformation. The encryption method comprises the following steps: generating a chaotic sequence by respectively utilizing an LTS system and a 2D-LASM system according to a hash key and an initial key generated by a plaintext image P; dividing the plaintext image P into an approximate component LL and three detail components HL, LH and HH by using discrete wavelet transform; performing lossless encryption on the approximate component LL by using a chaotic sequence X1, and performing lossy encryption on the detail components HL, LH and HH by using chaotic sequences U1 and K1; combining the encrypted matrixes LL1 and H1 into a complex domain matrix LLH1, and performing double random phase encoding on the complex domain matrix LLH1 by using two random phase mask matrixes to obtain matrixes LL2 and H2; quantifying the matrix LL2 and the matrix H2;carrying out the random p